You have the wrong person- stop harassing me

Please stop harassing me for your different debtors I don't know. I get sms and calls for different people's accounts everyday. You send me their outstanding balances. This must definitely be an infringements of POPI. I call you and tell you've got the wrong number but your consultants don't care. They say they will remove my number for all those different people but they don't. How can one number be the same number for different customers. Please please stop harassing or I will have to report this to the Ombudsman. Everyday everyday you harassing me for people I don't know.